Abstract: A fixture which is intended to be screwed firmly into bone tissue. The fixture includes a generally cylindrical anchoring portion provided with an external screw thread. The anchoring portion includes a cavity which extends from the insertion end of the anchoring portion. A number of slots which connect the cavity with the outside of the anchoring portion extend from the insertion end of the anchoring portion. Each slot is delimited by a leading slot wall and a trailing slot wall, the leading and trailing slot walls rotating in the direction defined by the screw thread when screwing in the anchoring portion. At least the radially outermost part of the trailing slot wall defines an angle with the radial direction and is inclined obliquely forward from within and outward in the direction of rotation.

Abstract: The invention is related to an arrangement used to attach a prosthesis to one or more fixtures (1) anchored in a person's bone tissue. Such a fixture (1) has a fastening part (8) for the prosthesis and said fastening part has a supporting surface the prosthesis and a said fastening part has a supporting surface (9) that engages a bearing surface (13) on the prosthesis. In accordance with the first aspect of the invention such a fixture (1) on its supporting surface (9) is provided with a deformation device (18). This is plastically deformable in a direction perpendicular to supporting surface (9) to compensate for any misalignment between supporting surface (9) and bearing surface (13). In accordance with a second aspect of the invention, the deformation device is, instead, arranged on the prosthesis supporting surface (13) in a corresponding way. The invention also incorporates a prosthesis anchoring system that includes a fixture having a deformation device.

Abstract: The invention relates to a dental prosthesis system incorporating a superstructure (4, 5), a positioning device, and fixtures (1) that are implantable in a person's jawbone. Each fixture (1) is anchored in the jawbone and its opposite end is arranged so that it will be possible to attach a superstructure (4, 5) to it. By means of the positioning device, fixtures (1) are implanted at definite positions and in definite directions, usually parallel directions. The superstructure includes prefabricated elements with fastening devices (8, 9) that can be attached to fixtures (1). In accordance with the invention, reference device (1a) is designed to put the positioning device in place in such a way as to reliably provide the aforesaid definite positions and directions, therewith facilitating the use of prefabricated superstructures. Through its other aspects, the invention relates to significant components suitable for a dental prosthesis system of this type.

Abstract: The invention is related to an arrangement used to attach a prosthesis to one or more fixtures (1) anchored in a person's bone tissue. Such a fixture (1) has a fastening part (8) for the prosthesis and said fastening part has a supporting surface the prosthesis and a said fastening part has a supporting surface (9) that engages a bearing surface (13) on the prosthesis. In accordance with the first aspect of the invention such a fixture (1) on its supporting surface (9) is provided with a deformation device (18). This is plastically deformable in a direction perpendicular to supporting surface (9) to compensate for any misalignment between supporting surface (9) and bearing surface (13). In accordance with a second aspect of the invention, the deformation device is, instead, arranged on the prosthesis supporting surface (13) in a corresponding way. The invention also incorporates a prosthesis anchoring system that includes a fixture having a deformation device.

Abstract: The invention is related to an arrangement used to attach a prosthesis to one or more fixtures (1) anchored in a person's bone tissue. Such a fixture (1) has a fastening part (8) for the prosthesis and said fastening part has a supporting surface the prosthesis and a said fastening part has a supporting surface (9) that engages a bearing surface (13) on the prosthesis. In accordance with the first aspect of the invention such a fixture (1) on its supporting surface (9) is provided with a deformation device (18). This is plastically deformable in a direction perpendicular to supporting surface (9) to compensate for any misalignment between supporting surface (9) and bearing surface (13). In accordance with a second aspect of the invention, the deformation device is, instead, arranged on the prosthesis supporting surface (13) in a corresponding way. The invention also incorporates a prosthesis anchoring system that includes a fixture having a deformation device.

Abstract: An anchoring screw (1) is disclosed for implantation in bone, consisting of a tissue compatible material for supporting prostheses, artificial joint components, or the like. The anchoring screw (1) has at least one slot (5, 5a) extending from its threaded outer surface at a distance from the insertion end (3). The slot (5, 5a) is arranged to receive a blanking element (6, 6a) which shields the slot (5, 5a) during the application of the anchoring screw (1) and its integration in a recess prepared beforehand in the bone during a healing stage. The blanking element (6, 6a) is replaced, after integration of the anchoring screw (1) with the bone, by a holder for a prosthesis, the holder including a web portion insertable into said slot. There is also disclosed an anchoring arrangement comprising at least one such anchoring screw and such a holder or coupling, and a method for application of such an anchoring arrangement in osseous tissue.

Abstract: An anchoring screw (1) is disclosed for implantation in bone, consisting of a tissue compatible material for supporting prostheses, artificial joint components, or the like. The anchoring screw (1) has at least one slot (5, 5a) extending from its threaded outer surface at a distance from the insertion end (3). The slot (5, 5a) is arranged to receive a blanking element (6, 6a) which shields the slot (5, 5a) during the application of the anchoring screw (1) and its integration in a recess prepared beforehand in the bone during a healing stage. The blanking element (6, 6a) is replaced, after integration of the anchoring screw (1) with the bone, by a holder for a prosthesis, the holder including a web portion insertable into said slot. There is also disclosed an anchoring arrangement comprising at least one such anchoring screw and such a holder or coupling, and a method for application of such an anchoring arrangement in osseous tissue.

Abstract: A method for supporting a prosthesis or part thereof on bone tissue utilizes an anchoring element (1) that is substantially rotationally symmetrical and is provided with external threads (20) and a central bore (2). At least one slit (3, 4, 5, 6) is arranged in spiral form around the longitudinal axis (13) of the element (1), extending through and over at least the major part (11, 12) of the outer wall of the element to communicate with the central bore. The major part is provided with external threads (20), and the spirality of the slits (3, 4, 5, 6) is the same as that of the outer threads (20). After drilling a hole to completion in bone tissue, an inner end portion of element (1) is forced into the hole while rotating element (1) and utilizing the external threads to cut complementary internal threads in the bone tissue. The prostheses or parts thereof are then secured to the outer end portion of element (1).

Abstract: An anchoring element (1) for supporting prostheses or part thereof. The anchoring element (1) is substantially rotationally symmetrical and provided with external threads (20) and a central bore (2). At least one slit (3, 4, 5, 6) is arranged in spiral form around the longitudinal axis (13) of the element (1) and extends over at least the major part (11, 12) of the outer wall of the element. The major part is provided with external threads (20), the chirality of the slit (3, 4, 5, 6) being the same as that of the outer threads (20).

Abstract: An anchoring element for implantation in bone or other tissue takes the form of an externally threaded screw, for example of titanium or other tissue compatible material. Such an anchoring element may be used, for example for holding prostheses or artificial joint components. To increase its rotational stability and prevent the element from becoming unscrewed, the threads of the screw are provided with notches, for example by forming spiral or straight grooves in the peripheral threaded surface of the element, which grooves intersect the thread turns to form these notches. After such an anchoring element has been implanted in bone tissue for example, the tissue draws into the notches to provide keys preventing rotation and unscrewing of the anchoring element.

Abstract: An anchoring element for implantation in bone or other tissue takes the form of an externally threaded screw, for example of titanium or other tissue compatible material. Such an anchoring element may be used, for example for holding prostheses or artificial joint components. To increase its rotational stability and prevent the element from becoming unscrewed, the threads of the screw are provided with notches, for example by forming spiral or straight grooves in the peripheral threaded surface of the element, which grooves intersect the thread turns to form these notches. After such an anchoring element has been implanted in bone tissue for example, the tissue draws into the notches to provide keys preventing rotation and unscrewing of the anchoring element.

Abstract: An anchoring element for implantation into first and second aligned bores of different diameters provided in bone tissue of two bones or two portions of a bone separated by a non-ossified tissue. A prosthesis is supported on the proximal end of the anchoring element. A first cylindrical portion is located at the distal end of the anchoring element and has a first external thread and an outer diameter corresponding to a diameter of the first bore. A second cylindrical portion is located at the proximal end of the anchoring element. The second cylindrical portion includes a second external thread and has an outer diameter corresponding to a diameter of the second bore. The first and second external threads have an equal pitch.

Abstract: A device for implanting in osseous tissue, for example in the skull of a patient, for electric transmission of signals to the inner ear, includes a rotationally symmetric body (1) of titanium or other tissue compatible material with an insertion end (2) for insertion into a bore prepared in osseous tissue beforehand and an application end (3) intended to remain external to the patient. A central through bore (4) connects both ends (2,3) of the body. An external screw thread (7) is provided adjacent the insertion end. An insulating element (9) is arranged in the bore and carries one or more terminal elements or contacts (12) connected with insulating electrical conductors (8). The conductors (8) extend from the contacts (12) through the axial bore at the insertion end or through openings in the peripheral wall surface of the body (1).

Abstract: A prosthesis system for replacing two or more adjacent teeth comprises prefabricated elements for fixing to the lower or upper jaw of a patient. The prefabricated elements include an arcuate bridge base, two or more substantially rotationally symmetric spacer elements, and, for each spacer element, a respective fixture or screw implantable in the jawbone. The system further includes an arcuate dental bridge comprising teeth, and an arcuate profile element supporting the teeth. On its underside the profile element has a groove or channel to receive the bridge base. Each implantable fixture or screw has a screw-threaded bore extending from its outer end for reception of a corresponding screw-threaded shank at one end of the respective spacer element. The bridge base has bores therein to receive fitting portions of the spacer elements and the bridge base is secured to the spacer elements by adhesive and/or by securing screws or nuts.

Abstract: A substantially cylindrical anchoring element for implantation in bone tissue is constructed to support prostheses, such as artificial joint components, tooth bridges or artificial teeth etc. The anchoring element has two cylindrical segments with end portions differing in diameter. The end portion with the smaller diameter is positioned at the distal or insertion part of the element and at least parts of both end portions are provided with a threaded portion having the same pitch. The anchoring element is implanted by forming relatively large and relatively small diameter aligned passages in the bone tissue. The smaller diameter segment of the anchoring element passes through the relatively large diameter passage and is self threaded in the small diameter passage. While self threading by the smaller diameter segment takes place, the larger diameter segment is self threaded in the large diameter passage.

Abstract: An artificial joint mechanism for use in reconstructing joints such as wrists and finger joints. The joint mechanism is designed for use between fixtures anchored in the bone and/or tissue on each side of the joint. The joint mechanism comprises a male part (1) with at least one joint pin protruding from a base plate (4) and having a substantially arc-shaped joint surface, and a female part (2) with a recess (13) corresponding to the joint pin and having a substantially arc-shaped defining surface (14) for contact with said joint surface in the male part.

Abstract: A fixture intended to be implanted into bone tissue, for example, the bone tissue of a jaw, for anchoring a prothesis, such as a tooth crown. The fixture includes a cylindrical head disposed on the end of a shaft for positionally fixing the prothesis. An upper and lower external thread section is formed on the shaft. The lower external thread section is screwed into a previously prepared hole in the bone tissue, the hole having a diameter that is substantially equal to a core diameter of the shaft. A thread-free zone is located along a mid-section of the shaft. The thread-free zone has a smooth outer surface to avoid the irritation of nerves present in the bone tissue in the vicinity of the fixture. Gently curving transitional portions connect the thread-free zone with the upper and lower external thread sections. The thread-free mid-section and the lower external thread section are provided with a coating of tissue friendly material.

Abstract: An anchoring element for supporting a joint mechanism is disclosed. The anchoring element is substantially rotationally symmetrical, at least partially hollow, and includes a material which is compatible with the tissue of a bone. The anchoring element has a surface which can be at least partially osseo-integrated with the tissue to achieve permanent endosteal anchorage in the longitudinal axis of the bone. The anchoring element is applied within the bone by: cutting the bone close to its joint to expose the marrow cavity of the bone; forming a space in the marrow cavity close to the joint; applying a guide sleeve in the space; and screwing the anchoring element into the marrow cavity while using the guide sleeve to center the anchoring element.

Abstract: An anchoring element for supporting a joint mechanism is disclosed. The anchoring element is substantially rotationally symmetrical, at least partially hollow, and includes a material which is compatible with the tissue of a bone. The anchoring element has a surface which can be at least partially osseo-integrated with the tissue to achieve permanent endosteal anchorage in the longitudinal axis of the bone. The anchoring element is applied within the bone by: cutting the bone close to its joint to expose the marrow cavity of the bone; forming a space in the marrow cavity close to the joint; applying a guide sleeve in the space; and screwing the anchoring element into the marrow cavity while using the guide sleeve to center the anchoring element.

Abstract: An anchoring element for supporting a joint mechanism is disclosed. The anchoring element is substantially rotationally symmetrical, at least partially hollow, and includes a material which is compatible with the tissue of a bone. The anchoring element has a surface which can be at least partially osseo-integrated with the tissue to achieve permanent endosteal anchorage in the longitudinal axis of the bone. The anchoring element is applied within the bone by: cutting the bone close to its joint to expose the marrow cavity of the bone; forming a space in the marrow cavity close to the joint; applying a guide sleeve in the space; and screwing the anchoring element into the marrow cavity while using the guide sleeve to center the anchoring element.